Locking device for mantle nuts



Nov. 10,1925. 1,560,924

- W. S. WESTON LOCKING DEVICE FOR MANTLE NUTS Filed April 6, 1923 Patented Nov. 10, 19 25.

U NITE WILLIAM s. wns'ron, or COLUMBIA, scorn cARo'LI-NA.

noonnve nnvrcsroa MANTLE News.

Application fil'edflpril 6; 1923. Serial N0. 630,352.

To all whom it may concern:

Be it known that I, VVILLIAM S. l/Vns'rorr,

a citizen of the United States, and a resident of Columbia, Richland County, and @tate of South Carolina, have invented certain new and useful Improvements in Lookingv Devices for Mantle Nuts, of which the following is a specification.

The present invention relates to gyratory crushing machines and particularly to means for preventing jamming of the mantle nuts of such machines.

In my co-pending application Faerial No. 576,146, filed July 19, 1922 is disclosed a device of this class interposed between the mantle of the crushing head, and the nut threaded upon the shaft for retaining the same in place whereby the full holding power of the nut on the mantle is retained, but which prevents the nut from being jammed on the mantle to such an extent that its removal cannot easily be accomplished. It has frequently been found, in cases where the annular lower edge of the mantle nut has had full bearing on the annular upper edge of the mantle, that this not has been turned down so tightly upon the mantle due to the action of the stone on the nut that its removal by unscrewing after a certain length of time, has been impossible. Where this occurs it is necessary to cut away the nut and to replace it, in removing the mantle. The present invention provides a means for preventing this jamming of the mantle nut which is simpler, cheaper and more satisfactory than similar devices heretofore designed and suggested.

The invention may be employed in various forms and in the accompanying drawings one form is illustrated by way of example.

Figure 1 is a side elevation partly broken away of the upper end of the crushing head of a gyratory crushing machine showing the invention incorporated therewith.

Figure 2 is a section on line 22 of Figure 1.

The gyratory shaft is indicated at 10, the crushing mantle at 11, and the mantle nut at 12, this nut being threaded to the shaft at 13. A plurality of notches 14 are formed in the lower edge of the mantle nut and a plurality of similar notches 15 in the upper edge of the crushing mantle, these notches having inclined rear walls and curved end walls as shown. The rear walls of the notches are inclined to the axis of the shaft 1-0,, and when the several notches of the mantle and nut are brought into these walls are substantially register, parallel.

After the mantle is positioned on the crushing head the nut 12 is screwed down" until its lower edgeis spaced only a slight distance from the uppereclge of. the mantle:

and the sets of notches 14 and 15, respectively, are brought into register. The cylindrical pins 16 are then applied, one pin being inserted into the opening provided by each pair of registering notches, as illustrated. The mantle nut is then turned in the reverse direction or backed off by means of wrenches so that the pin is firmly clamped between the nut and mantle, as illustrated at 17, and a body of soft metal such as lead inserted to prevent movement of the pin in the initial operation of the machine. The shaft gyrates in the direction of the arrow A, Figure 1, and the stone in the crushing hopper between the crushing nut and the concaves exerts a tangential force on the nut in the opposite direction so that it has a tendency to screw down the mantle nut more and more tightly. The pins 16 transmit the thrust of the nut to the mantle, but at the same time hold the annular edges of the mantle and nut apart so that jamming does not occur. The pins are of relatively soft steel so that any slight variations in the notches will not cause warping of the mantle nut or straining of the threads. In addition pins of any size can be used. lVhcn it is desired to remove the mantle, the nut is turned down somewhat (in a clockwise direction, Fig. 2), so that the pins are released because of the taper of the notches, after which they may be removed and the nut turned in a counter-clockwise direction to remove the same from the shaft.

It will be understood that left hand threads may be employed instead of right hand threads and the slope of the notch walls 14 and 15 reversed, if thought desirable, and other changes of design and arrangement of the component parts of the invention made without departing from its spirit and scope.

What is claimed is:

1. In a device of the class described, in combination, a shaft, a mantle member fixed thereon, a nut member threaded on the shaft, said members having their adjacent edges notched, and a pin in registering notches of said members, said pin being of such thick ness as to prevent contacting of the adjacent edges of said members whereby it transmits the thrust of the mantle to the nut Without permitting said nut to become jammed against the mantle.

2. In a device of the class described, in combination, a shaft, a mantle member fixed thereon, a nut member threaded on the shaft, said members having their adjacent edges notched, the rear Walls of said notches being inclined to planes normal to the axis of the shaft, and a cylindrical pin in registering notches of said members, said pin being of such diameter as to prevent contacting of the adjacent edges of said members, whereby it transmits the thrust of the mantle to the nut Without permitting said nut to become jammed against the mantle.

8. In a device of the class described, in combination, a shaft, a mantle member fixed thereon, a nut member threaded on the shaft, such members having their adjacent edges notched, the rear Walls of said notches be ing inclined to planes normal to the axis of the shaft and being substantially parallel when in register, and a cylindrical pin in registering notches of said members, said pin having a diameter sufiiciently great to prevent contacting of the adjacent edges of said members whereby it transmits the thrust of the mantle to the nut Without permitting said nut to become jammed against the mantle.

WILLIAM S. WESTON. 

